A device (1) for placing a dental splint (2) which is intended to be fixed at the level of the lingual, palatal or vestibular surfaces of at least two adjacent teeth (10) to immobilize the teeth. The placing device (1) has at least one flexible and elongated guiding support (3) carrying the splint (2), at least one positioning element (4, 4′), mounted so as to slide on the guiding support (3) behind the splint (2), and arranged for being positioned substantially in front of an interproximal gap (9) between the at least two adjacent teeth (10). A pressing mechanism (5, 5′) coupled to the positioning element (4, 4′) and arranged to bring the positioning element (4, 4′) close to the at least two adjacent teeth (10) to be interlocked, when pressed, to bring the splint (2) in contact and conform with the lingual, palatal or vestibular surfaces.